Art of preparing organic compounds containing arsenic.



To all whom it may concern.

UNlTED STATES PA ENT OFFICE.

LORENZ ACI-I, or 'MANNHEIM-WALDHQF. ALBERT 'RoTHMA'NN, or HEIDELBER-G. AND 'HEBMANN DIETERICH, or MANNHEIM, GERMANY, ASSIGNORS To'rAnBwER-KE VOR-M. MEISTER LUCIUS & BRUENING, o nooHsT-oN-THE AIN, GER-MANY.

ART OF PREPARING ORGANIC COMPOUNDS CONTAINING ARSENIC.

No Drawing.

Be it known that We, LORENZ AcH, ALBERT ROTHMANN, and HERMAN DIETERICH, c1t1'- Zens of the German 'Empire, residing at Y lWIannheim-lVa-ldhof, Heidelberg, and Mannheim, Germany, respectively. have invented certain new and-useful Improvements in.

' is therapeutic-ally still more eflicaciou-s than the'Art .of Preparing Organic Compounds Containing Arsenic; and we do hereby declare the following to be a full, clear, and eXact' description-of the invention, such as will enable others skilled in the artto which the non-halogenized bismethyla-mino-tetramino-arseno benzene: (see U. S. Patent No. 1081079) in so far as the ratio of the f curative" d'ose to thetolerated dose is shifted Y in favor'of the halogenizedproduct.

The new derivativesare produced by subjecting, organic compounds containing arsenic and having the general formula I cHaNn (where R designates a univalent radical such and where X indicates that the arsenic is Specification of Letters latent.

j Application filed June 22, 1914. Serial No. 846,573.

Patented Apr; 2.3. 1916.

and by heating the resulting 2-halogen-lmethylnitramino 3.5 dinitro-benzene-l-ar sinic acids with reducing agents such as tin,

' stannous chlorid, zinc or zinc dust instrong given-for the purpose of fully explaining the'same. i

fEXample 1': Dissolve 24.5 grams of 2 chloro d-s limethylamin'o-benzene 1 arsenic oxid in'245 grams ofconcentrated sulfuric aci andcoo'l the solution to a temperature of about '5 G. Add to this solution in small portions at a time 80 grams of nitratang mixture, consisting 'of equal parts of fuming nitric jacid j and concentrated sulfuric acid, takiiig care that the temperature does not rise above 35 C. Allow .the mixtune to standfor several hours at a temperatureof 3 5 G.' ;andthen pour the same upon ,whenthe nitro compound separatesjou't fin. the form of yellow flakes. The compound-is filtered off under vacuum and washed with ater. To purifythesame "dissolve the body in sodium'acetate solution-a-nd,after filtering, precipitate by means of hydrochloric acid. The2-chloro-'3.5-dinitroj- 43- methylnit'ramino'-.benzene l arsinic .a'cid obtained in this uvay forms a slightly yellowish powder which dissolves in sodium hydrate sol'ution with a red color and explodes on heating. It is easily solu 'ble inhot water, methyl and ethyl alcohol,

and acetone; insoluble in ether, chloroform and benzene. Add gradually while stirring 15.4 grams of zinc dust to 8 grams of 2-chloro l-methylnitramino-3.5-dinitro -benzene-1- v arsinic acid suspended in 200 cc. of a mixv ture consisting of equal parts of alcohol and v concentrated hydrochloric acid. The nitro compound gradually becomes dissolved. After all the zinc has been added heat the whole over a flame until the solution be comes clear. Add to the filtered liquid another 100 grams of concentrated-hydrochloric acid. cool the mixture, and filter off the zinc double salt of the reduction product. Dissolie the product in water and precipitate the dichloro-bismethylamino-tetramino-arseno benzene by the addition of dilute caustic soda lye. The hydrochlorid of the base can be precipitated by addingstrongly concentrated hydrochloric acid, filtering, and washing with'alcoholand ether. The free base or the dichloro-bismethylamino-tetramino-arseno benzene obtained in this way is insoluble in water. On exposure to the air it quickly turns a dark color. The hydrochlorid is a yellow-green powder easily soluble in water, and in soda and sodium bicarbonate solutions. it

Example 2: 8 grams of 2,-chloro-ianethylnitramine-3.6-dinitro-benzene-l-arsinic acid obtained in the way described in Example 1 are suspended in 300 grains of concentrated hydrochloric acid. and to this suspension '28 grams of powdered tin are gradual added. The mixture becomes considerably heated thereby so that at the com meiicement the reaction must be moderated by cooling. The arsinic acid gradually becomes dissolved, and upon cooling thoroughly. the stannous bichlorid separates from the mixture. It is drained, dissolved in water, and caustic soda lye added in excess until the tin oxid remains in solution. The base, which separates from the solution, is filtered off, and'after washing with water it is dissolved in dilute hydrochloric acid. The hydrochlorid of the base is separated according to the manner described in the preceding example.

Example 3: Dissolve 29 grams of 2- bromo-t-dimethylamino-benzene l arsenic oxid in 290 grams of concentrated sulfuric acid and cool'"to a temperature of --5 G. Add in small portions at a time grams of nit'ating acid which have been thoroughly cooled, taking care that'the temperature does not rise above 35 C. Keep the mixture for several hours at this temperature, and then pour upon ice when the nitro compound separates out in yellow flakes. \Vash the product thoroughly, dissolve in sodium acetate solution filter, and again precipitate by means of hydrochloric acid. The Q-bromo-4i-1nethylnitra mino-3.5-dinitro benzene-l-arsinic acid obtained in this way is a yellow powder that explodes on heating and decomposes. It dissolves in caustic soda lye with a red color, and easily solufble in hot-water, methyl or ethyl alcohol.

It is insoluble in ether, chloroand acetone. form, and benzene. Suspend 8.9 grams of E2-bromo-d-mcthyl-nitramino-3.5-dinitro-benzene-l-arsinic acid obtained in the manner described in 300 grams of concentrated bydrochloric acid. Add gradually to this solution 28 grams of tin dust. A marked rise of temperature is noticeable on the addition of the tin dust. lVhen the reaction is nearly completed heat. the mixture on the water bath until the mixture is completely dissolved.

On cooling thoroughly the tin double salt separates out. Filter ofi thetin double salt, dissolve in water, and treat with an excess of caustic soda lye until the tin oxid remains in solution. Then filter oif the precipitated base, wash well with water, and dissolve in dilute hydrochloric acid. The chlorid of the base can be precipitated by adding concentrated hydrochloric acid in excess; filtering ed the product obtainech'and washing with alcohol and ether. The dibromo-bismethyl-' am1notetran11no-arseno benzene is insoluble ona N\R where R represents a univalent radical, in the para position to the arsenic group to the action of a nitrating reagent.

2. The process'of preparing organic compounds containing arsenic which comprises subjecting a benzene compound of arsenic containing halogen in the ortho position and the group where R represents a uniralent radical, in the para position to the arsenic group to the action of a nitrating reagent.

3. The'process of preparing organic compounds containingarsenic which comprises subjecting a benzene arsenic oxid containing halogen in the ortho position and the group where R represents a univalent radical, in the-para position to the arsenic group to the action of a nitrating reagent.

4:. The process of preparing organic compounds containing. arsenic which comprises subjecting an aromatic compound of arsenic containing chlorin in the ortho position and the group where R represents a univalent radical, in

- the para position to the arsenic group to thr action of a mixture of concentrated nitric pounds containing, arsenic Which comprises .40 j

" subjecting a benzene arsenic oxid containing .sition and the group ,oo

subjecting a benzene arsenic oxid containthe group N (CH in the-para position to compoundscontaining arsenic Which com- PIISGS sub ect ng, an aromatic compound-of .the resulting 2-11.alogen-3.5adinitro-4c-methylf ijifso eev itramino-benzene-l-arsinic acid with reducing agents. a

12 The process of preparing organic 'compounds containing arsenic which comprises subjecting an aromatic compound of arsenic containing halogen in the ortho position and the group I action ofa nitrating reagent. j j

5. The process of preparing 0rganiccom pounds containing arsenic which comprises subjecting a benzene arsenic oxid containing chlorin in the ortho position and the group I Where R represents a univalent radical, in the para position to the arsenic group to the action of a nitrating reagent. I

6. The process of preparing organic com,- pounds containing arsenic which comprises subjecting an aromatic compound of arsenic containing chlorin inthe ortho position and the group N (CH in the para position to the arsenic groupto the action of a nitrat: 111 reagent. v Theprocess of preparing organic'compounds containing arsenic which comprises where represents a univalent radical,-=in the para position to the arsenic group to the action of mixture of' concentrated nitric acid -and concentrated sulfuric acid, and treating the resulting 2-halogen-3.5-dinitrowith reducing agents, 7 4

13. The process of preparing organic prises subjecting an aromatic compound of arsenic containing chlorin in the ortho position and the group .'N( CH in the para ing chlorin in the ortho position and the. position to the arsenic group to the action group N(CH in the para position to the arsenic group to the action of a nitrating reagent. a j

8., The process of preparing organic compounds containing arsenic which comprises subjecting an aromatic compound of arsenic containing halogen in the ortho position and the group concentrated sulfuric acid, and treating the resulting 2-chloro -3.5 dinitro 4; methylniing agentsl I 14. The process, of preparing organic compounds containing arsenic which comprises subjecting a benzene arsenic oxid con-, taining chlorin. in the ortho position and the /'CH3 j N group N (CI-I in the para posit on to-the Where R represents a univalent radical, in

the para position to the arsenicegroup to the concentrated nitric 301d and concentrated sulfuric, acid, and treating "the resulting 2-chloro-3.5-dinitro-et-methylnitramino'-ben -zene-1-arsinic acid with reducing agents.

15. The process. of preparing organic compounds containing arsenic hichcomprises subjecting an aromatic compound of arsenic containing chlorin in the ortho position and the group N(CH in the para positionfto the arsenic group to the action of a mixture of'concentrated nitric acid and concentrated sulfuric acid, and treating the acid and concentrated sulfuric acid. I 9. The process of preparing organ c comsubjecting'an aromatic compound of arsenic containing chlorin in-the ortho position and the arsenic group to the action of a mixture of concentrated nitric acid and concentrated sulfuric acid. v

10. The process of preparing organic com- Pounds contamlng alsemc hlch' compnses tramino-benzene-1 arsinic acid\rit'lra-cid're-- ducin a ents. 1"5

chlorin 1n theorth'o osltion and the 'roup b 1 N(CH in the para position to the azse nic The Plepmmg Olga group to' the action of amixture of concen-. trated nitric acid and concentrated sulfuric acid. a v

11. The process of preparing organic prises subjecting a benzene arsenic oXid con .taining chlorin in the ortho position andthe" groupN(CH i'n'the para posi tion to the arsenic group to the action of aimix'ture of concentrated nitric" acid and concentrated sulfuric a'cicLj and treatingthefiesulting 2-chloro 3.5-dinitro l-methylnitrainino bn vzene-l arsinic acid with agents.. 41 -r-g 5 -171=The process' Where R-rep'resents a u-nivalent radical, in compounds containing arsenic which compara position to. the arsenic grouptothe prises subjecting an aromatic compound of action of a nitrating reagent, and treating arsenic containing chlorin 1n the ortho posiarsenic containing halogen in the ortho po-' CH3 N compounds containing arsenic; which com-f acid reducing r" i. i I

tion and the group }T(CH in the'para 4 methylnitramino benzene 1 arsinic acid compounds containing arsenic which com--x of a mixture of concentrated nitric acid and traniino-benzene-1 -arsinic acid ithreduc- -arsenic group. to the action of a'mixture ofiic resulting 2 chloro 3.5 dinitro 4 4 m etliylni- E J v I of" prep r n Organic position to the arsenic group to the action ofa mixture of concentrated nitric concentrated sulfuric acid. resulting 2chloro dinitro 4 -1netl1ylni- 5 tramino-benzene-l-arsinic acid with a metal and an acid.

18. The process of preparing organic compounds containing arsenic which con1- prises subjecting a benzene arsenic oxid coni taining chlorin iu the ortho position and the group N (CH5) in the para position to the arsenic group to the action of a mixture of concentrated nitric ,acid and concentrated sulfuric acid, and treating the resulting 2-chloro-3.o-dinitro-el-ineth ylnit ra nino benzcne-l-arsinic acidwith a metal and an acid. 19. The process of preparing organic compounds containing arsenic which comprises subjectin'g an aromatic compound of arsenic containing chlorin-in the ortho p'osition and the group N(CH,,), in the para position to the arsenic group to the action of .a mixture of concentrated nitric acid and concentrated sulfuric acid, and treating-the resulting 2 ch1oro-3.5-dinitro 4 methylnitraniino-benzeue-l-arsinic acid with tin and an acid. r :20. The process of preparing organic compounds containing arsenic which comprises acid and and treating the subjecting'a benzene arsenic oxid containing chlorin in the ortho position and the group N(CH in the para'position to the arsenic group to the action of a mixture of concentrated nitric acid and concentrated sulfuric acid, and treatingthe resulting 2- chloro-3.5-dniitroal-methylnitramino benzene--1-arsinic acid with tin and an acid.

21. The process of I preparing organic compounds containing arsenic which co1n- -40 prises subjecting an aroinatic compound of arsenic containing chlorin in the ortho position and the group N(CH in the para 1 I position" to the arsenic group to the action of a mixture of concentrated nitric acid and '45 concentrated sulfuric acid, and treating the resulting Q-chloro -3.5- dinitrounethylnitrainino-benzene-l-arsinic acid with tin and hydrochloric acid.

22. The process of preparing organic compounds containing arsenic which comprises subjecting a benzene arsenic oXid containing chlorin in the ortho position and the group N( (31L) in the para position to the arsenic group to the action of a mixture of concentrated nitric acid 311d concentrated sulfuric acid, and treating tl-fe resulting 2- chloro-Sfi-dinitrolmeth lnitraniino ben v zenc-l-arsinic acid with tm and hydrochloric acid.

23. The process of prep: 411g organic compounds containing arsenic wh ch comprises subjecting an aromatic compound of arsenic containing chlorin in the ortho position in the para ation to the arsenic group to, the co,

in water'and air, the hydrochlorids of the baw 9f tion of, a mixture of concentrated nitric acid and concentrated sulfuric acid, and treating the resulting Q-chloro3.5-dinitro--lniethylnitramino-benzene-I-arsinic acid with finely powdered tin and hydrochloric acid. The process of preparing organic compounds containing arsenic which con1- prises subjecting a benzene arsenic oKid. containing chlorin in the ortho position and the group N(CH in the para position to the arsenic group to the action of a mixture of concentrated nitric acid and concentrated sulfuric acid, and treating the resulting 2 chloro-3.5-dinitrol emethylnitramino heir zene-l-ai'sinic acid with finely powdered tiufand hydrochloric acid.

25. The process of preparing organic compounds containing arsenic which consists in subjecting an aromatic compound of arsenic containing halogen in the ortho 5 position and the group where R represents a univalent radical, in Q the para position to the arsenic group to the action of a mixture of concentrated nitric acid and concentrated sulfuric. acid, treating the resulting 2-halogen-35-dinitroa methylnitramindbenzene 1 -i1rsinic acid 9 with finely powdered tin and hydrochloric acid, cooling and separating the resulting tin salt oft-he. 2,2'-dihalogen-3,5,3,5'-tetra1ninolA-bismethylamino-1,1'-arsno benzene, dissolving the same inwater and adding sodium hydrate solution in excess.

26. The process "of preparing organic compounds containing arsenic which con sists in subjecting 2-chloro-4-diniethylaminohemmed-arsenic oxid to the action of a mixture,ofconccntrated nitric acid and concentrated sulfuric 'acid, treating the result? ing 2-cinder-0-3.5-dinitro-l-methylnitramin3- benzene-l-arsinic acid with finely powdered tin and hydrochloric acid, cooling and sepa- 0 rating the resulting tin salt of the 2,2-dichimp-3,5,35-tetraniino-el,4 bismethylaminc-1,l-arseuo-benzene, dissolving the same in water and adding sodium hydrate solution in excess. i

27. As a new class of chemical compounds the 2,2'-dihalogen-3,5,35 tetramino4,4-

-bisinethylamino-1,1-arseno benzenes of the general formula.

and being solid andyellow,colored,"insoluble .irkemng on exposure to l the;

our signatures in the presence of two witnesses. v

LORENZ ACH. ALBERT ROTHMAN N. HERMANN DIETERICH. W'itnesses as to Albert Rothmann and Hermann Dieterich: FRrrz M ELLER,

H. MERLE COCHRAN. l/Vitnesses as to Lorenz A011:

JEAN GRUND. CARL GRUND. 

